Help with middle name please

Hi, I'm new to this site.
I haven't had trouble naming my children before but I'm stumped for the middle name for my third child.
I like names that aren't totally uncommon, but still unique. My first child (daughter) is DarcyWillow (we are Australian and Darcy is not as common here)My second (male) is FinleyJames (James is a family tradition)
We are expecting another little man to our family and we love the name August (especially the nicknames Augie and Gus) but nothing I come up with matches, and my husband is having trouble too.
Any help would be greatly appreciated!
Thanks Sheree